Talked to Zeitronix and they suggest that this is most probably a ground offset issue, so I am visiting my wiring guru tomorrow and we'll see. I will report back.

UPDATE:

I've spent most of the day rewiring and measuring. Now the Zeitronix is grounded together with the ECU which makes no difference in voltage. I have checked the voltages and the output voltage is exactly the same as what the ECU gets, not even a 0.01V difference and yet the issue remains, so the conversion must be wrong, I have no other ideas.

I have tried to set this up with my LC-2 controller, but no luck so far. I found an adress via DDillenger's code approach, but I just get a steady value all the time. I´m guessing that it´s not the correct adress, but I havent gotten into disassembly of the file yet.

To provide a temporary solution, could it be possible to log USHK when I set up the controller to 0/1v for lambda 0.5/1.5 ? If the limit that port can read out through ushk is 1v that should be possible, provided I calculate the correct conversion.

For my lpg controller I have done a similar thing: I programmed the output to be 0,5v=0.5lambda and 1,5v=1.5lambda. That way I dont even need a conversion to read it, it just gives the right value.

Anyone that logs wideband through uushk_w on a 512kb narrowband without rear o2 that could share their *.ecu file for reference?

So it turns out that if you unplug the wideband sensor from Zeitronix it will show 14.7 / lambda 1 and emit 2.51V on the wideband linear output (white) wire. With ignition on it stays 2.51V forever, then you start the engine, so there is load on the electrical system (alternator, etc.) and suddenly it will emit around 3.01V (for me at least) with the wideband still unplugged from the Zeitronix. Taking 3.01V and substracting the difference from our provided offset -9.6 I am at -10.1 and suddenly my logger values are spot on with actual ones on the Zeitronix LCD. Next week I am going to try to figure out what causes this interference exactly (leaning toward alternator, or TFSI coil conversion since the coils do not have separate ground so high voltage passes through the ECU). So the Zeitronix provided values are perfect in a laboratory environment for sure

I'd suggest anyone running Zeitronix and logging the linear output to double check their mixture because it will probably be way richer than logged.

So it turns out that if you unplug the wideband sensor from Zeitronix it will show 14.7 / lambda 1 and emit 2.51V on the wideband linear output (white) wire. With ignition on it stays 2.51V forever, then you start the engine, so there is load on the electrical system (alternator, etc.) and suddenly it will emit around 3.01V (for me at least) with the wideband still unplugged from the Zeitronix. Taking 3.01V and substracting the difference from our provided offset -9.6 I am at -10.1 and suddenly my logger values are spot on with actual ones on the Zeitronix LCD. Next week I am going to try to figure out what causes this interference exactly (leaning toward alternator, or TFSI coil conversion since the coils do not have separate ground so high voltage passes through the ECU). So the Zeitronix provided values are perfect in a laboratory environment for sure

I'd suggest anyone running Zeitronix and logging the linear output to double check their mixture because it will probably be way richer than logged.

I know, necrobump.

Did anything become of this? Posted factors didn't work for me (not surprised). I had to modify them to align logged output with what the gauge displayed. I am using A 30-0300 X Series gauge from AEM. In the manual it states analog voltage from .5 to 4.5. I used the switched 12v+ from the fused side of the heater wire (because lazy), and the signal reference from the ecu (grey wire) to the brown wire on the AEM (analog negative) with the power ground for the controller to the negative terminal of the battery. Anyone else using this particular wideband controller? Output is linear, but wanted to know if my offset and factor might still be slightly off.

« Last Edit: November 04, 2016, 12:26:14 AM by vwaudiguy »

Logged

"If you have a chinese turbo, that you are worried is going to blow up when you floor it, then LOL."

I got it working in the end, on my 018H wideband ECU it ended up being pin 69 and the RAM address was 2 bytes after uulsuv_w.I checked it against the reading on my gauge and it is surprisingly accurate.

Much better EGTs after the addition of WMI (used to see upwards of 850C)!